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The rotary kiln was invented in 1873 by Frederick Ransome. [1] He filed several patents in 1885-1887, but his experiments with the idea were not a commercial success. Nevertheless, his designs provided the basis for successful kilns in the US from 1891, subsequently emulated worldwide.
PAHs (according to EPA 610) in the exhaust gas of rotary kilns usually appear at a distribution dominated by naphthalene, which accounts for a share of more than 90% by mass. The rotary kiln systems of the cement industry destroy virtually completely the PAHs input via fuels. Emissions are generated from organic constituents in the raw material.
In 1893, the company exhibited at the World's Fair in Chicago. 1898 saw the design and manufacture of the first rotary cement kiln in Europe. This was followed in 1912 by the construction of the Jesarbruch plant near Nienburg (Saale) for the Sächsisch-Thüringische Portland-Cement-Fabrik Prüssing & Co. KGaA.
This became a specification for portland cement. The next development in the manufacture of portland cement was the introduction of the rotary kiln, patented by Frederick Ransome in 1885 (U.K.) and 1886 (U.S.); which allowed a stronger, more homogeneous mixture and a continuous manufacturing process. [3]
By far his most economically important invention (Patents 5442/1885, 10530/1887 and 15065/1887) was the rotary cement kiln. Although his experiments with the idea were not a commercial success, his designs provided the basis for successful kilns in the US from 1891, subsequently emulated worldwide.
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Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure.